Analog Devices MAXREFDES1302 User manual

Brand: Analog Devices

Model: MAXREFDES1302

Type: User manual

Analog Devices MAXREFDES1302 is a True Wireless Stereo (TWS) reference design that provides a complete power and battery management solution for TWS applications. It features a small size, low power consumption, high efficiency, and outstanding accuracy with low cost. The design is fully tested and includes a cradle, earbuds, and a power delivery path. The cradle obtains power from USB and outputs 5V for 1-Wire charging, while the earbuds are powered by the cradle through DS2488 and charge the battery on the earbud side.

Rev 0; 11/21

Introduction

MAXREFDES1302 is a reference design for TWS appli-

cation based on the Maxim 1-Wire® solution. This refer-

ence design provides power and battery management

solutions for the TWS cradle and earbuds (right & left),

including battery charging, battery monitoring, and power

management. An OLED display is mounted on the cradle

side to display earbud connection state, state-of-charge

(SOC in %) and remaining capacity (CAP in mAh) of bat-

teries of the cradle and earbuds. A serial port monitor can

also be used to show such information.

On the cradle side, USB Type-C® charging is realized

by the MAX77751, which integrates a 3.15A switch

charger and BC1.2. Also, USB Type-C Configuration

Channel (CC) detection pins of the MAX77751 enable

automatic USB Type-C power source detection and input

current limit configuration. The MAX17262 is used to

monitor battery remaining capacity and state-of-charge

of the batteries. The MAX17262 implements the Maxim

ModelGauge™ m5 EZ algorithm and features internal

current measurement for up to 3.1A pulse currents. The

MAX17224 is an ultra-low quiescent current boost DC-DC

converter with a 225mA/0.5A/1A peak inductor current

limit and True Shutdown™. The MAX38640 is nanoPower

family of ultra-low 330nA quiescent current buck (step-

down) DC-DC converters that operate from 1.8V to 5.5V

input voltage and support load currents of up to 175mA

with peak efficiency of 96%. While in shutdown, there is

only 5nA of shutdown current. The MAX32655 microcon-

troller is used to configure the fuel gauge, 1-Wire commu-

nication, and 1-Wire power transfer.

On the earbud side, the DS2488 provides a cost-effective

solution for power transfer and communication between

the TWS cradle and earbuds. The DS2488 is a low-cost

simple bridge device with a single dedicated contact on

each side of the bridge which enables power delivery

for the battery charging, small message exchange, and

the state reporting between two microcontroller-based

subsystems. The battery management system for ear-

buds consists of the MAX77734 and MAX17262. The

MAX77734 provides highly integrated battery charging

and power supply solutions for the low-power applications

where size and efficiency are critical. The MAX32655 on

the earbud side configures the MAX77734, MAX17262,

DS2488 and MAX98050. The MAX98050 is a low-power,

high-performance audio codec with integrated low-latency

digital filters for wireless hearables, headsets, and head-

phones.

Main features and benefits:

●Integrated solution

●Small size

●Low power

●High accuracy

●Low cost

Table 1 and Table 2 provide an overview of the Cradle

design specification and the Earbuds design specification,

respectively.

Table 1. Cradle Design Specification

Table 2. Earbuds Design Specification

PARAMETER SYMBOL MIN MAX

Battery Voltage BAT 3.1V 4.6V

USB Input Voltage CHGIN 4.8V 5.2V

Boost 5V Output 5V 4.8V 5.2V

Buck 3.3V Output 3V3 3.2V 3.4V

PARAMETER SYMBOL MIN MAX

Battery Voltage VBAT 3.3V 4.6V

LDO 3.3V Output VCC_3.3 3.2V 3.4V

MCU 1.8V Output VCC_1.8 1.7V 1.9V

MCU 1.2V Output VCC_1.2 1.1V 1.3V

Maxim is a registered trademark of Maxim Integrated Products, Inc.

1-Wire is a registered trademark of Maxim Integrated Products, Inc.

USB-C is a registered trademark of the USB Implementers Forum, Inc.

Arm is a registered trademark and a registered service mark of Arm Limited.

Cortex is a registered trademark of Arm Limited.

Bluetooth is a registered trademark of Bluetooth SIG, Inc.

ModelGauge is a trademark of Maxim Integrated Products, Inc.

True Shutdown is a trademark of Maxim Integrated Products.

Maxim 1-Wire True Wireless Stereo (TWS)

Cradle and Earbuds

Analog Devices

│

MAXREFDES1302

Designed–Built–Tested

This document describes the hardware shown in the

Figure 1 and provides a detailed technical guide to design

a 1-Wire TWS power management system, which has a

small size, low power consumption, high efficiency, and

outstanding accuracy with low cost. The design is fully

tested, and technical details are shown in the following

sections.

Design Consideration

The power supply system for TWS applications has the

following features:

●Small size – The size of the earbuds should be as

small as possible. Since more functions are needed

to be implemented into the device, the size of device

components plays an increasingly important role in

the design. The diversity of the functions provided by

the device directly depends on the number of compo-

nents the device could contain.

●Low power – The batteries provide the power for the

whole system. Because of the limited size and energy

density of the battery, low power systems generally

have longer service life. Wearable devices usually

have two operation modes: standby mode and oper-

ation mode. The working time of the most devices in

standby mode accounts for over 90%, so it is import-

ant to reduce the standby current.

● High eciency – In the latest TWS applications,

earbuds are typically charged by the cradle. However,

sometimes the battery voltage of the cradle may be

larger or smaller than the battery voltage of earbuds.

High VIN/VOUT ratio of earbuds charger may result

in the loss of output energy on the cradle side, and

generated heat on the earbud side.

●High Accuracy – The earbuds require highly accu-

rate battery state-of-charge measurement, which is

required by the market.

●Low Cost – The wearable headphones must be com-

petitive in price, which requires the cost of the whole

system to be as low as possible.

Figure 1. MAXREFDES1302 hardware.

www.analog.com Analog Devices

│

Design Procedure Power Solution

This power management platform includes a cradle, ear-

buds, and a power delivery path.

Step 1: Select Power Delivery Solution

For TWS applications, the cradle needs to supply power

to the earbuds. At the same time, it is necessary to

communicate between the two to realize the message

exchange and the real-time battery state update. Since

the size and cost are significantly important in the TWS

solutions, 1-Wire dual-port link IC-DS2488 is selected

to meet the design requirement. DS2488 provides a

cost-effective solution for the power transfer and com-

munication between the TWS cradle and earbuds. It is

a simple bridge device with a single dedicated contact

on each side of the bridge which enables power delivery

for the battery charging, small message exchange, and

the state reporting between two microcontroller-based

subsystems.

Step 2: Select Cradle Power Management

Solution

The cradle obtains power from USB and outputs 5V for

1-Wire charging. The 3.15A USB Type-C autonomous

charger, MAX77751, charges the 1-Cell Li+ battery

on the cradle side. The battery is monitored by the

MAX17262, which is an ultra-low power fuel-gauge IC

with integrated internal current sensing function. The

system requires two extra power rails: 3.3V and 5V.

The 3.3V power rail is generated by a buck convert-

er MAX38640. It provides power for microcontroller

MAX32655, as well as the OLED panel. The 5V power

rail is generated by a boost converter MAX17224 from

3.3V. It provides 5V stable power supply for the earbuds

via 1-Wire.

Step 3: Select Earbuds Power Management

Solution

The cradle delivers power to the earbuds through

DS2488 and charges the battery on the earbud side.

The MAX98050 needs 1.8V and 1.2V analog power

supplies and 3.3V, 1.8V and 1.2V digital power supplies.

The MAX32655 needs 3.3V digital power supply. The

MAX77734 integrates a linear-mode Li+ battery charger,

low-dropout linear regulator (LDO), analog multiplexer,

and dual-channel current sink driver. The MAX77734

provides one 150mA LDO to power the MAX32655,

and the Single-Inductor Multiple-Output (SIMO) inte-

grated with the MAX32655 can provide power for the

MAX98050.

Step 4: Calculate Current Consumption

Here is the current consumption of the earbuds in nor-

mal operation mode (BLE turned off) when the system is

only powered by the batteries. The current consumption

of the MAX32655 excluding SIMO can be calculated as:

MCU Z

22.2uA

I 100MH 2.22mA

= ×=

Here, 100MHz is the maximum frequency of the

MAX32655 with an average current of 22.2μA/MHz.

Thus, its maximum power is about 7.33mW when the

supply voltage is 3.3V.

The quiescent current with LDO enabled of the

MAX77734 is 18μA at 3.7V battery voltage, that is

75.6μW. The DS2488 only consumes 6μA at 3.3V in

active mode and the MAX17262 only consumes 16μA

at 3.7V battery voltage in active mode, so the total

power consumption of the DS2488 and the MAX17262

is 87μW. The MAX98050 full-scale playback power

is 31mW (32Ω Headphone). Since the MAX98050 is

ciency, whole power consumption of the MAX98050 is

34.44mW. Thus, it can be assumed that the maximum

power consumption of the system is about 41.91mW. A

130mAh 3.7V battery can work for about 12 hours con-

tinuously to power the system.

Here is the current consumption of the cradle. The bat-

tery only quiescent current of the MAX77751 is 30μA

at 3.7V battery voltage, that is 111μW. The MAX17262

consumes 16μA at 3.7V battery voltage, which is

59.2μW. The quiescent supply current of the MAX17224

is 300nA at 3.3V output voltage, which is 0.99μW. The

quiescent supply current of the MAX38640 is 330nA at

3.3V input voltage, which is 1.01μW. The max power

of the MAX32655 excluding SIMO is about 7.33mW

when the supply voltage is 3.3V. The OLED module

VG-2832TSWUG01 is 0.33μW (100μA at VDD of 3.3V).

The consumption for the operation of the DS2488 via IOA

is 10μA at 5V, which is 50μW. Thus, it can be assumed

that the maximum power consumption of the system is

about 7.55mW. A 1500mAh 3.7V battery can work for

about 735 hours continuously to power the system.

Usually, there are two earbuds in the cradle. Given that

batteries on the cradle side and the earbud side are

charged to full and earbuds could not be charged when

the remaining battery capacity of the cradle is smaller

than 5%, the use time for one full charge of the whole

system battery life can be calculated as:

CRADLE BATTERY CAPAITY 95%

EARBUD BATTERY CAPCAITY 2

TIME CRADLE POWER CONSUMPTION

EARBUD POWER CONSUMPTION 2

(1500 95% 130 2)mAH 3.7V 68h

(7.55 41.91 2)mW

+×

× +× ×

= ≈

+×

Thus, the whole of the TWS headset system can work

continuously for 65 hours (about 3 days) for one full

charge.

www.analog.com Analog Devices

│

USB

Type

Conne

ctor

VBUS VSYS

CHGIN

MAX77751

ENBST BATT

Charging cradle

Earbuds

GND

I2C

MAX17262

BATT

GND

ALRT

SYS

/ALRT

I2C_BUS

MAX32655

VREGI

I2C0_SCL(P0.10)

I2C_BUS

I2C0_SDA(P0.11)

32OUT

RS TN

32KIN

SWDIO(P0.28)

SWCLK(P0.2 9)

OWM_IO(P0. 18)

OWM_PE(P0.19)

VSS

P2.0

SPI0_SS0(P0.4)

SPI0_SCK(P0.7)

SPI0_MOSI(P0.5)

P2.1

P2.2

RST K EY

ABS07-

32 .768K H

Z-6-T

SWD

3.3 V

CHG/IO

/ CS

S CL K

SDIN

D/C

/ RE S

/ALRT

OLED

Type C

Charger

Int ernal Current

Sen sing Fuel Gaug e

Li+

1-Wire/BLE/S IMO

MCU

OUT

GND

MAX38640

Buck

OUT

GND

MAX17224

Boo st

DS2488

TO KE N

I OB PIOA

I OA

GND

MAX77734

LDO

B AT T

CHGIN I2C

I2C

MAX17262

B AT T

GND

ALRT

S YS

I2C_BUS1

FG_ALRT

I2C

I RQ

BCLK

LRCLK

DIN

DOUT

INP1~3

INN1~3

DMC1~ 3

DMD1~ 3

MICB IAS1 ~3

OUT P

HW_EN

OUT N

A VD D 1

DVDDIO

DVDD

M BV D D

I2C_BUS2

IOB

External

Inpu t Port

DVI

Output

Port

MAX98050

S YS

VSYS

CD/PIOC

DNP VCC_3.3

PIOB

TO KE N

CHG/IO

I2C_BUS1

MAX32655

UART0A_RX(P0.0)

I2C0_SCL(P0.10)

I2C_BUS1

I2C0_SDA(P0.11)

RS TN

UART0A_TX(P0. 1)

SWDIO(P0.28)

SWCLK(P0.2 9)

VSS

P2.0

P2.1

P2.2

P2.3

VREGI

RST K EY

SWD

TOKEN

FG_ALRT

HFXKIN

HFXOUT

FA-20 H

32.0000 M

F12Y-W3

ANT

50Ω PCB

BLE_LDO_IN

VREGO_D

CHR/L

UART MODE

CHR/L

BLE_ANT_CTRL1(P1.9)

BLE_ANT_CTRL0(P1.8) ANT CTRL

A VD D 2~3

P2.4

VCC_3.3

1-Wire Link

Li+

Int ernal Current

Sen sing Fuel

Gaug e

IOB

Aud io Codec

GND

1-Wire/BLE/S IMO

MCU

PMIC with

Charger

GND

LDO_IN

I2C0_SCL(P0.30) I2C _BU S2

I2C0_SDA(P0.31)

VREGOA

VREGOB

VCC_1.8

VCC_1.2

VREGOC

VCOREA

VCOREB

VCC_1.2

VC C_1 .8

VCC_1.2

VC C_1 .8

VCC_1.8

PIOA P2.2

I2S

I2S_BUS

I2S(P1.2-1.5) I2S_BUS

PIOA

Figure 2. MAXREFDES1302 block diagram.

Detailed Description of Hardware

Figure 2 shows the block diagram of the

MAXREFDES1302. When the earbuds are connected

to the cradle via two touch points, the cradle starts

scanning and then sends a hand-shaking signal to the

earbuds. If the earbuds are detected, the cradle delivers

power to the earbuds to charge the batteries of the ear-

buds. At the same time, the cradle collects information of

the batteries on the earbud side is instantly available and

shows their state-of-charge. The cradle also measures

its own battery and shows its state-of-charge. The ear-

buds should be able to play audio when they are outside

the cradle. In this case, additional I2S audio inputs and

outputs are necessary.

www.analog.com Analog Devices

│

Microcontroller

The MAXREFDES1302 uses the MAX32655 micro-

controller on the cradle side and the earbud side. The

MAX32655 microcontroller is an advanced system-on-

chip featuring an Arm Cortex-M4F CPU for efficient

computation of complex functions and algorithms. The

MAX32655 integrates power regulation and manage-

ment with a SIMO buck regulator system and supports

1-Wire protocol. The MAX32655 also supports the latest

generation Bluetooth 5.2 Low Energy radio, supporting

low-energy audio transmission. The MAX32655 can

meet the design requirements perfectly due to its small-

size and low-power with large memory space, and it can

support 1-Wire interface and BLE. The push buttons

SW1 and SW2 can be used to reset the respective

microcontroller manually.

Audio Codec

The MAX98050 is a low-power, high-performance audio

coder/decoder (CODEC) with integrated low-latency

digital filters for the wireless hearables, headsets, and

headphones.

The MAX98050 features a mono playback channel with

a 5-band biquad equalizer and a high-efficiency, fully

differential hybrid class-AB/class-D headphone ampli-

fier. The playback headphone amplifier is optimized

for extremely low output noise levels and minimized

quiescent power consumption at highest output power

efficiency.

The MAX98050 has three microphone input channels,

which can support many audio cases. Each channel can

individually record from either an external analog or dig-

ital microphone, and then can route audio data to both

the record channels (to the digital audio interface) and

the internal low-latency digital filter channels. A fourth

record channel to the digital audio interface is provided

to allow the host to monitor the playback channel output

digital data.

The MAXREFDES1302 uses the MAX98050 on the

earbud board. All of the inputs and outputs of the

MAX98050 are reserved, which can help users to test

its performance.

Battery Measurement

The MAX77751 and the MAX17262 are used for cra-

dle battery management while the MAX77734 and the

MAX17262 are used for earbud battery management.

The MAX77751 is a standalone, 3.15A charger with

integrated USB Type-C CC detection and reverse boost

capability. The fast-charge current and top-off current

thresholds are easily configured with resistors. The

MAX77751 operates with an input voltage of 4.5V to

13.7V and has a maximum input current limit of 3A.

The IC also implements the adaptive input current limit

(AICL) function that regulates the input voltage by reduc-

ing the input current, to prevent the voltage of a weak

adapter from collapsing or folding back.

The MAX17262 is an ultra-low power fuel-gauge IC

which implements the Maxim ModelGauge m5 algorithm.

The MAX17262 monitors a single cell battery pack with

integrated internal current sensing for up to 3.1A pulse

current. The IC monitors a single-cell battery pack and

supports internal current sensing for up to 3.1A pulse

current. The IC provides the best performance for bat-

teries with 100mAhr to 6Ahr capacity. The ModelGauge

m5 EZ makes fuel-gauge implementation easy by elim-

inating battery characterization requirements and sim-

plifying host software interaction. The ModelGauge m5

EZ robust algorithm provides tolerance against battery

diversity for the most lithium batteries and applications.

The MAX77734 is a tiny power-management integrated

circuit (PMIC) for applications where size and simplicity

are critical. The IC integrates a linear-mode Li+ battery

charger, low-dropout linear regulator (LDO), analog mul-

tiplexer, and dual-channel current sink driver. The char-

ger is designed for small-battery systems that require

accurate termination as low as 0.375mA. The circuit

can instantly regulate the system voltage when an input

source is connected even if the battery is drained.

www.analog.com Analog Devices

│

Power Supply

On the cradle side, the MAX38640 is used to generate

a stable 3.3V output from VSYS to power the microcon-

troller and the OLED module. The MAX17224 is used to

generate a stable 5V output from 3.3V, which supplies

the charging current for the earbuds via 1-Wire bus.

A MOSFET is adopted to control the timing of 1-Wire

charge and 1-Wire communication.

On the earbud side, the MAX77734 features a 150mA

LDO, which provides ripple rejection for the audio and

other noise-sensitive applications. It provides the main

power for the MAX32655 and the MAX98050. The SIMO

of the MAX32655 provides the analog power rail for the

MAX98050.

The battery should be small while it needs to supply

enough energy for continuous operation of the cradle

and earbuds. A 1500mAh 3.7V Li+ battery is selected

in a cradle design for maintaining the operation of the

cradle and charging batteries of the earbuds. Its charge

termination voltage is 4.2V, and the MAX77751 on the

cradle side configures its fast-charging current to be

500mA, and its top-off charging current to be 100mA.

An 130mAh 3.7V Li+ battery is selected in the earbud

design for earbud working consumption. Its maximum

charging current is 100mA and its charge termination

voltage is 4.2V.

Data Communication

The cradle and earbuds need to shake hands and

communicate with each other. On the earbud side, the

DS2488 works as a simple bridge device between the

cradle and the earbud. The microcontrollers on the

cradle side and the earbud side can communicate with

the DS2488 via IOA pin and IOB pin, respectively. The

microcontrollers write or read the buffer of the DS2488

to realize small message exchange. Which side has the

token of the DS2488 can communicate with the DS2488.

For example, if the cradle has the token, it can write or

read the DS2488 via IOA pin. On the contrary, if the ear-

bud has the token, it can write or read the DS2488 via

IOB pin. Which side has the token depends on the state

of the earbuds.

When earbuds are in the cradle, and the cradle is

closed, the cradle charges the batteries of the earbuds.

At this moment, the token is on the earbud side and ear-

buds can update the information of the batteries into the

buffer via IOB pin. Once the cradle is open, the cradle

stops charging earbuds and the token is on the cradle

side. Thus, the cradle reads the buffer of the DS2488

and show the information of the earbud batteries and

the cradle battery on the OLED module or to the serial

port. At the same time, the cradle updates its own battery

information into the buffer for subsequent application

expansions.

When earbuds are not in the cradle, the token is on the

earbud side, and earbuds update the information of the

batteries into the buffer via IOB pin for the next connec-

tion between the cradle and earbuds. At this moment,

the cradle cannot detect any DS2488 and only shows its

own battery state.

Detailed Description of Firmware

The MAXREFDES1302 firmware includes two parts:

the cradle part and the earbud part. Both the two parts

consist of the peripheral (e.g., fuel gauge, PMIC, etc.)

initialization and configuration steps, and an infinite main

loop for 1-Wire control.

Cradle Firmware Part

After power-up, the microcontroller on the cradle side

initializes GPIOs, configures the fuel gauge, MAX17262,

and then configures the OLED module. Then it goes

into an infinite loop to poll the state of a GPIO which

indicates whether the cradle is open or not. If the cradle

is closed, the cradle disables 1-Wire module, enables

5V charge voltage to IOA to charge the earbuds. At this

moment, the cradle shows its own battery information

on the OLED module or to the serial port. If the cradle

is open, the cradle disables 5V charge voltage and

enables the 1-Wire module to read or write the buffer of

the DS2488. At this moment, the cradle shows its own

battery information, together with the earbud battery

information read from the buffer on the OLED module or

to the serial port.

Figure 3 is the flow chart of the cradle firmware.

www.analog.com Analog Devices

│

MAI N

GPIO INITIALIZATION

C INITIAL IZATION

FUEL GAUGE MAX17262 CONFIGURATION

(EZ MODE)

SPI I NITIALI ZATION

OLED CONFIGURATION

WHILE( 1)

READ CRADLE FUEL GAUGE

(SOC & CAP)

IS CUR RE NT STATE

OF CRADLE OPEN?

IS PREVIOU S STATE

OF CRADLE OPEN?

DISABLE 5V CHARGE VOLTAGE

ENABLE 3.3V 1-WIRE CHAR GE VOLTAGE

SHOW L & R EARBUD ROMID, CONNECTION

STATE AND BATTERY INFO

1-WIR E MODULE INITIALIZATION

READ L & R EARBUD DS2488 BUFFER

UPDATE PREVIOUS STATE

IS PREVIOU S STATE

OF CRADL E CL OSED?

1-WIR E MOD UL E SHUT DOW N

DISABLE 3.3V 1-WIRE CHARGE VOLTAGE FOR

100 MSEC

IS CRA DLE SOC > 5%?

DISABLE 5V CHARGE

VOLTAGE

ENABLE 5V CHARGE

VOLTAGE

SHOW CHARGE STATE

SHOW CRADLE BATTERY INFO

UPDATE PREVIOUS STATE

Figure 3. Cradle firmware flow chart.

www.analog.com Analog Devices

│

MAI N

GPIO INITIALIZATION

C INITIAL IZATION

FUEL GAUGE MAX17262 CONFIGURATION

(EZ MODE)

BATTERY CHARGER MAX77734

CONFIGURATION

1-WIR E CONFIGURATION

WHILE(1)

READ EARBUD FUEL GAUGE

(SOC & CAP)

IS CHGIN INPUT VALID ? IS TOKEN HIGH?

SET CHARGER CONFIGURATION

ENABLE CHARGER

IS CHA RGER DISABLE?

SET CHARGER DISABLE

WRITE EARBUD DS2488 BUFFER

Figure 4. Earbud firmware flow chart.

Earbud Firmware Part

After power-up, the microcontroller on the earbud

side initializes GPIOs, and configures the fuel gauge,

MAX17262, and then configures the charger, MAX77734.

Then it goes into an infinite loop to poll the state of the

charger whether the input source is debounced or not.

If the input source is valid and greater than 4.0V, the

charger is enabled and starts the charging process. At

this moment, an infinite loop polls the state of a GPIO

which indicates whether the TOKEN is HIGH or not. If

it is LOW, the cradle gets the communication token. If

TOKEN is HIGH, the earbud gets the communication

token. When TOKEN is HIGH, the battery information

collected from the fuel gauge would be written to the

buffer of the DS2488.

Figure 4 is the flow chart of the earbud firmware.

www.analog.com Analog Devices

│

Operation Overview

The use of the MAXREFDES1302 is simple. The cradle

can work when it is connected to the USB socket, and

it can also work when the battery is connected to the

board. When the earbuds are connected to the cradle,

the cradle automatically communicates with the ear-

buds, and collects the battery information of the earbuds

periodically to show it on the OLED module. When the

earbuds are not connected to the cradle, the cradle only

shows its own battery information. A serial port monitor

can also be used to display the information on commu-

nication and charging.

Program Download Interface

The serial wire debug (SWD) interface is used to pro-

gram the firmware of the earbuds via connectors on the

board (J2 for programming the cradle and J7 for pro-

gramming the earbud). The MAXREFDES1302 uses the

MAX32625PICO board as the debug emulator.

Design Resources

Download the complete set of Design Resources

including schematics, bill of materials, PCB layout, and

test files.

www.analog.com Analog Devices

│

Revision History

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 11/21 Initial release —

www.analog.com Analog Devices

│

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is

assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that

may result from its use.Specifications subject to change without notice. No license is granted by implicationor

otherwise under any patent or patent rights of Analog Devices. Trademarks andregistered trademarks are the

property of their respective owners.

Analog Devices MAXREFDES1302 User manual

Analog Devices MAXREFDES1302 User manual

Analog Devices MAXREFDES1302 User manual

Related papers

Other documents